@ARTICLE{Ackley85alearning,
    author = {David H. Ackley and Geoffrey E. Hinton and Terrence J. Sejnowski},
    title = {A learning algorithm for Boltzmann machines},
    journal = {Cognitive Science},
    year = {1985},
    volume = {9},
    pages = {147--169}
}

@misc{ wiki:Hopfield,
   author = "Wikipedia",
   title = "Hopfield net",
   url = "\url{http://en.wikipedia.org/wiki/Hopfield_net}",
 }
 
 @misc{ wiki:Boltzmann,
   author = "Wikipedia",
   title = "Boltzmann machine",
   url = "\url{http://en.wikipedia.org/wiki/Boltzmann_machine}",
 }
